A series of π-conjugated molecules based on diimidazolepyridine derivatives were designed, synthesized by Suzuki coupling reaction and cyclization reaction and characterized. Diimidazolepyridine motif as the main structure could improve the thermal stability and optical property of the materials. All of the target compounds exhibited good thermal stabilities with T_d values in the range of 416–490 °C. These compounds showed steady blue light emissions in the range of 424–478 nm and high quantum yields (0.33–0.69) in solution. Especially, compound 4f achieved appropriate energy gap (E_g = 2.69 eV) and high fluorescence quantum yields (Φ_f = 0.69) because of introducing electron-donating group, such energy gap was helpful to electronic transfer and transport. The materials have great potential for good electronic-transmission materials in OLEDs.

设计了一系列基于二咪唑并吡啶衍生物的π共轭分子，通过Suzuki偶联反应和环化反应合成并表征。以二咪唑吡啶基序为主要结构可以提高材料的热稳定性和光学性能。所有目标化合物都表现出良好的热稳定性，T _d值在416–490°C的范围内。这些化合物在溶液中的424-478 nm范围内显示稳定的蓝光发射和高量子产率（0.33-0.69）。特别是，化合物4F实现适当的能隙（E_克 = 2.69电子伏特）和高荧光量子产率（Φ _˚F = 0.69），因为引入了给电子基团，这种能隙有助于电子转移和传输。该材料在有机发光二极管中具有良好的电子传输材料的巨大潜力。